由于土地具有地理位置的固定性、（）等自然特性，使价格独占性较强。

A.一定性

B.不增性

C.客观性

D.个别性

E.整体性

In a new study of African elephants，researchers have    four distinct characters that are among a group.

A．convinced

B．identified

C．differed

D．existed